39539813 has 2 divisors, whose sum is σ = 39539814. Its totient is φ = 39539812.

The previous prime is 39539809. The next prime is 39539821. The reversal of 39539813 is 31893593.

39539813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22877089 + 16662724 = 4783^2 + 4082^2 .

It is a cyclic number.

It is not a de Polignac number, because 39539813 - 2² = 39539809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39532813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19769906 + 19769907.

It is an arithmetic number, because the mean of its divisors is an integer number (19769907).

Almost surely, 2^39539813 is an apocalyptic number.

It is an amenable number.

39539813 is a deficient number, since it is larger than the sum of its proper divisors (1).

39539813 is an equidigital number, since it uses as much as digits as its factorization.

39539813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 41.

The square root of 39539813 is about 6288.0690994931. The cubic root of 39539813 is about 340.6786129229.

The spelling of 39539813 in words is "thirty-nine million, five hundred thirty-nine thousand, eight hundred thirteen".